vb.net barcode reader sdk Fig. 10-7. Half-wave recti er. in Software

Create USS Code 128 in Software Fig. 10-7. Half-wave recti er.

Fig. 10-7. Half-wave recti er.
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Fig. 10-8.
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Full-wave recti er.
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Capacitance
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The recti er is an important part of all circuits that convert AC signals into DC. The signal coming out of the recti er is still AC, but it is at least all on the same side of ground level. What path does the power take through the bridge recti er when the input signal is positive What path does the negative signal take Remember that conventional current follows the direction of the diode s arrows. Try This: Take four diodes and assemble them in the recti er con guration. Now hook up your 9 V battery to the inputs and measure the output. Reverse the battery input and see if the output changes at all. Does it What voltage do you get out of the recti er Is it the same in both con gurations Measure the battery to see how much you are putting in. The next step in the AC to DC signal conversion will be ltering. Capacitors, conveniently enough, can be used to lter and condition AC signals.
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Another useful side e ect of the diode is that, in the correct form, it will emit light. Light-emitting diodes (LEDs) are used everywhere in electronic devices to signal and communicate to the user. Before LEDs were developed, electronic devices had to use ordinary, though very small, resistive light bulbs. LEDs use less power than lights and, as their price dropped to their current low levels, rapidly took over their job. Now the white ultra-bright LEDs are even replacing light bulbs in ashlights, streetlights, vehicle signal indicators, and other high-intensity applications. An even more intense form of light-emitting diode is the laser diode. This is used in all of your CD and DVD players as well as in industry and science. It also makes a great cat toy.
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While most diodes are used in the forward conduction mode, the Zener diode performs its function in the reverse mode. The Zener diode (Fig. 10-9) was rst described by the American physicist Clarence Melvin Zener. When the
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Fig. 10-9.
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Zener diode.
CHAPTER 10 Capacitance
input exceeds the breakdown voltage in regular diodes, the diode is destroyed. The Zener diode, however, has a very low breakdown voltage and can conduct power in reverse mode without being damaged. Up to a limit, of course. In the forward mode the Zener diode acts like a signal diode. In reverse mode it blocks current like the regular diode until the voltage gets high enough and then it conducts, unlike the regular diode. This e ect can be used to limit input voltages and keep circuits safe from overloading. The Zener diode in conjunction with a signal diode can clamp an input, forcing it to remain between zero and the Zener diode s breakdown voltage (Fig. 10-10). If the Zener is set to conduct at a reverse of 4 V, the output of the circuit in Fig. 10-10 might look like Fig. 10-11. There are many other clever ways that diodes can be used to modify or limit a signal. See if you can think of a few more yourself.
Fig. 10-10.
Diode clamping circuit.
Fig. 10-11.
Clamped signal.
Capacitance
Capacitors
CAPACITOR
Everything acts like a capacitor to some extent, the same as everything is a resistor. Of course, there is also a speci c component called a capacitor that provides a speci c capacitance. Capacitance is measured in farads, named after Michael Faraday, and is represented by the letter F. Michael Faraday was training to be a bookbinder when he developed an interest in science. From there he went on to do many things, including laying the foundations for our understanding of electromagnetism. The symbols for the capacitor are shown in Fig. 10-12, as well as pictures of a couple of representative components. We ll return to this gure shortly. While it is easy to get a feel for what a resistor does, capacitors can be a bit tricky. Let s start with some history.
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